Field Definitions are Available Here
Collection
string (1024)
Restrictions and legal prerequisites for accessing the collection. These include any access constraints applied to assure the protection of privacy or intellectual property, and any special restrictions or limitations on obtaining the collection. These restrictions differ from Use Restrictions in that they only apply to access.
NOT_ACCESS_RESTRICTED
/RestrictionComment
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:resourceConstraints/gmd:MD_LegalConstraints/gmd:useLimitation/gco:CharacterString
Descriptive Information (ECHO)